Metal detector



FIG. 1 is a perspective view of the metal detector, showing the new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a top plan view thereof. 

The ornamental design for a metal detector, as shown and described. 